Alert archive / Florida / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 87, NWS Miami, FL

July 4, 1997Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Jul 4, 1997, 3:30 PM EDT for Collier County, Florida. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 4, 1997, 3:30 PM EDT (19:30 UTC)
Expired
Jul 4, 1997, 5:30 PM EDT
In force
2 hr
Issued by
NWS Miami, FL
Area
Whole counties

County Collier County, FL

The radar

The Miami radar (KAMX), 111 km from the middle of the area, began a volume at 19:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Miami, FL (KMIA), launched 12:00Z, 7.5 hours before the alert went out and 113 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Miami, FL at 12:00Z on 1997-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1578 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 12:00Z on 1997-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1578 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
815 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
13 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMIA 041930 RRA
SVRMIA
FLC021-042100-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MIAMI FL
330 PM EDT FRI JUL 4 1997
 
THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  530 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHWEST FLORIDA
 
   ...COLLIER COUNTY
 
AND THE ADJACENT COASTAL WATERS
 
 
NATIONAL WEATHER SERVICE RADAR INDICATES MORE THUNDERSTORM
ACTIVITY ACROSS COLLIER COUNTY WHICH WILL LIKELY PRODUCE
SEVERE WEATHER THROUGH 5 PM.
 
SEVERE THUNDERSTORMS WILL BE SEEN IN A BAND EAST TO WEST
NEAR MARCO ISLAND AND OVER ADJACENT WATERS...AS WELL AS
EAST ALONG HIGHWAY 41 NEAR OCHOPEE. SOME WATERSPOUTS
ARE POSSIBLE IN THE AREA AROUND MARCO ISLAND.
 
OTHER SEVERE THUNDERSTORMS WILL POSSIBLY AFFECT AREAS
STRETCHING ALONG INTERSTATE 75.
 
 
DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN A SEVERE THUNDERSTORM. SEEK
SHELTER IN A STRONG BUILDING. STAY AWAY FROM WINDOWS. DO NOT USE
TELEPHONES OR ELECTRICAL APPLIANCES.

The office that day

Everything else NWS Miami, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 4, 1:55 AM EDTSevere Thunderstorm WarningMFLMonroe65 min
Jul 4, 2:04 PM EDTSevere Thunderstorm WarningMFLHendry61 min
Jul 4, 2:34 PM EDTSevere Thunderstorm WarningMFLCollier56 min
Jul 4, 2:57 PM EDTSevere Thunderstorm WarningMFLGlades, Hendry63 min

Nearby

Severe Thunderstorm Warnings in Florida, 1997Every severe thunderstorm warning in 1997

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.